Apple on Monday released Mac OS X 10.5.6, a recommended update for all Mac OS X 10.5.x Leopard users that includes general operating system fixes that enhance the stability, compatibility and security of Macs. Mac OS X 10.5.6 Server was also released in addition to Security Updates for client and server Macs still running Mac OS X 10.4.11 Tiger.

One of the primary focuses of Apple's upcoming Mac OS X 10.5.6 Update will be to improve the reliability of data syncing between the company's MobileMe Internet service and users on notebook computers or slower networks.